In the Linux kernel, the following vulnerability has been resolved:
chardev: fix error handling in cdev_device_add()
While doing fault injection test, I got the following report:
------------[ cut here ]------------ kobject: '(null)' (0000000039956980): is not initialized, yet kobject_put() is being called. WARNING: CPU: 3 PID: 6306 at kobject_put+0x23d/0x4e0 CPU: 3 PID: 6306 Comm: 283 Tainted: G W 6.1.0-rc2-00005-g307c1086d7c9 #1253 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:kobject_put+0x23d/0x4e0 Call Trace: <TASK> cdev_device_add+0x15e/0x1b0 __iio_device_register+0x13b4/0x1af0 [industrialio] __devm_iio_device_register+0x22/0x90 [industrialio] max517_probe+0x3d8/0x6b4 [max517] i2c_device_probe+0xa81/0xc00
When device_add() is injected fault and returns error, if dev->devt is not set, cdev_add() is not called, cdev_del() is not needed. Fix this by checking dev->devt in error path.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-toolsUpgrade kernel-headersUpgrade bpftoolUpgrade python-perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-livepatch-4.14.304-226.531Upgrade kernelUpgrade python-perfUpgrade perf-debuginfoUpgrade kernel-livepatch-5.15.86-53.137Upgrade kernel-tools-develUpgrade perfUpgrade kernel-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade kernel-livepatch-5.10.165-143.735 | May 20, 2026 | May 20, 2026 |
| Debian | — | Upgrade linux | Sep 17, 2025 | Sep 17, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade python3-perfUpgrade bpftool | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 15, 2025 |
| Ubuntu | — | Upgrade linux-riscv-5.15Upgrade linux-intel-iotgUpgrade linux-oracleUpgrade linux-fipsUpgrade linux-lowlatencyUpgrade linux-azure-fde-5.15Upgrade linux-intel-iot-realtimeUpgrade linux-raspiUpgrade linux-azure-5.15Upgrade linux-ibmUpgrade linux-kvmUpgrade linux-aws-5.15Upgrade linux-gkeopUpgrade linux-intel-iotg-5.15Upgrade linux-aws-5.4Upgrade linux-gcp-5.4Upgrade linux-realtimeUpgrade linux-azure-fdeUpgrade linux-oracle-5.15Upgrade linux-hwe-5.4Upgrade linux-oracle-5.4Upgrade linux-azure-fipsUpgrade linux-aws-fipsUpgrade linux-nvidiaUpgrade linux-gcpUpgrade linux-aws-hweUpgrade linux-gkeUpgrade linux-gcp-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-azure-5.4Upgrade linuxUpgrade linux-iotUpgrade linux-ibm-5.4Upgrade linux-bluefieldUpgrade linux-gcp-fipsUpgrade linux-hwe-5.15Upgrade linux-nvidia-tegra-5.15Upgrade linux-azure-4.15Upgrade linux-hweUpgrade linux-raspi-5.4Upgrade linux-awsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-azureUpgrade linux-gcp-4.15 | Sep 19, 2025 | Sep 16, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 15, 2025 |
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